Automatic die



April 1934- T-. BYs sinz El AL 1,953,529

AUTOMATIC DIE F iled Feb 25; 1930 e Sheets-Shet 1 if A 1/ J W J.

' April! 3, 119340 E. T. BY-SSHE ET AL 1,953,529

AUTOMATIC DIE Filed Feb. 25, 1950 6 Sheets-Sheet 2 April 3,1934, E. T.BYssHE ET AL 1,953,529

' AUTOMATIC DIE Fjiled Feb. 25, 1930 6 Sheets-Sheet 3 April 3, 1934. E.T. BYSSHE ET AL.

AUTOMATICDIE Filed Feb. 25, 1950 6 Sheets-Sheet 5 29 /2511 I I faial iWMM April 1934 E. T. BYSSHE El AL 1,953,529

AUTOMATIC DIE Filed Feb. 25, 1950 6 Sheets-Sheet 6 i nmmmmmnu PatentedApr. 3, 1934 PATEN r OFFICE AUTOMATIC DEE Ernest T. Bysslie and RobertR. Finn, Springfield,

Vt., assignors to Jones & Lamson Machine Company, Springfield, Vt., acorporation of Vermont Application February 25, 1930, Serial No. 431,498

13 Claims.

This invention relates to automatically opening dies and has for one ofits objects to produce a die of this type which may be usedsatisfactorily where great accuracy in the finished work is required.

" adjustment.

A further object is to produce 'a die by which threads may be cut on thework very close to the face of the work-holding chuck or to shoulderedportions of the work.

A further object is to produce such a die in which chasers of thetangent type and of substantial length may be used with a die of therelatively small diameter which can be successfully applied to screwcutting machines of stand ard dimensions and clearances already in use.

For securing great accuracy of work, especially with chasers oi thetangent type, the chasers are accurately ground to shape andare-adjustably carried in accurately ground holders movable inaccurately fitting ways in the die, and the chasers are rigidly backedwhen in service and when released are released simultaneously at aplurality of positions spaced angularly about the axis of the die.

In order to permit the use oi chasers of the tangent type and yet permitthe die to be of the necessary small diameter so as to be applicable totypes of machines already in extensive use, the chasers are supported onthe end face of the die, and by so mounting them it is possible for thechasers to cut close to a shoulder on the work or to the work-holdingchuck.

This application is a continuation in part oi our application Serial No.352,107, April 3, 1929,

' for Automatic dies.

For a more complete understanding of this invention reference may be hadto the accompanying drawings in which Figure l is a side elevation of adie constructed according to this'invention.

Figure 2 is a front elevation partly in section of the same.

Figure 3 is similar to a portion of Figure L, but showing a modifiedmicrometer form of chaser Figure 4 is a detail plan showing the adjust-imerit of Figure 3.

Figure 5 isa side elevation of the same.

Figure 5a is a fragmentary view partly broken away showing a furthermodification.

Figure 6 is a longitudinal section through the die on line 6-6 of Figure1 showing the die closed.

Figure to is a view similar to the upper portion. of Figure 6,butshowing the die open.

Figure 7 is a section on'line 7-7 of Figure 6.

Figure 8 is a detail section on line d-t of Figure '7. y I

Figures 9, 10 and 11 are sections on lines 9--9, 10--10 and 11-11,respectively, of Figure 6.

Figure 12 is a view similar to Figure 10, Tout showing the parts in thedie open position.

Figure 13 is a detail plan of the die, the outer casing being removed,the full line position show= ing the die closed and the dotted lineposition showing the die open.

Figures to to 21 are detail perspectives oi various parts of the 0116.

Figure 22 is a perspective of a tangent type chaser.

Figure is a view partly in elevation and partly in section shovnng amodified construction having an internal trip.

Figure 24 is a similar view showing a shoulder trip.

Figure 25 is a fragmentary view partly in tion and showing a modifiedform of external trip.

Figure 26 is a fragmentary front elevation partly in. section showingthe construction oi Figure 25.

As shown in the drawings the die comprises a body member '1 showndetached in Figure 14. This member comprises a shank portion 2 and ahead portion 3. The head portion 3 is provided with means at its forwardface as for supporting the chasers with capability of movement towardand from the longitudinalaxis of the die. For this purpose intersectingradial dovetail slots 5 are shown as formed in this end face for thereception of chaser holders 6, one of which is shown detached inFigureZl. Each holder has a dovetail portion 7 slidably fitting one ofthe grooves 5. These cooperating parts, including the forward face ofthe head portion 3 and the mating rear face of the holders 6, should beground and lapped accurately to form so that the die holders may be heldaccurately in proper position. There may be clearance at the root'of theportion 7. The re face 8 ofeach die holder rests squarely and inst theforward face portion' l of the body 1. er 1. Thus the chaser holder isaccurately supported free from liability of rocking or. other play.

One side face of each holder is provided with adjusted position, theside'face 11 of the holder is shown as provided with a dovetail. slot 12and In order to secure I of a locking and releasing plug 193.

the chaser 10 is provided with a mating dovetail portion 13. Theseportions and the confronting side face of the holder and the rear faceof the chaser should also be ground and lapped accurately. There may beclearance at the root of the chaser dovetail, but it is important thatthe rear face of the chaser on both sides of the dovetail andparticularly at the outer edge where the cutting teeth are positionedbear accurately fiat against the chaser holder; By this accurateengagement between the chasers and holders and between the holders andbody portion, ac-' curacy of positioning of the chaser teeth may bemaintained, possibility of tilting or other lost motion between theparts being reduced to the minimum. This is highly important andparticularly so when the chasers 'are carried on the forward face of thedie body where they may cut close to shouldered work. The rear edge faceof the chaser slidably engages the forward face of the die body, and itis moved perpendicular to the axis of the body portion. Thus for anygiven number of chaser teeth the cutting teeth at the forward end of thech'asers are at the minimum distance from the front face of the die bodythus to keep to the minimum the effective lever arm tending to tilt thechaser away from the work by engagement of these cutting teeththerewith.

Any suitable means may be provided for fixing the chasers longitudinallyrelative to their holders. Three constructions for this purpose areillustrated in Figures 2 to Ed. The rear portion 15 of the chaser at thedovetail 13 is shown in Figurs 2 to 5 as provided'with ratchetserrations and fitting these serrations and slidable in an aperture 18in a corresponding holder, in the construction shown in Figure 2, is aplug 19 having its outer end face 20 shaped to mate the serrations 15.As shown in Figure 2 this plug 19 is pressed into contact with thechaser as by means of a spring 21 seated in a socket in the rear end ofthe plug and reacting against the rear face 22 of a chamber 24 withinwhich the plug 19 is slidably fitted. The plug 19 is laterallyperforated as at 191 for the passage therethrough of a stem 192 The stem192 is smaller than the perforation 191 but has a head 194 at its innerend having its opposite end faces beveled which is of a size toslidingly fit this I perforation. This head is also slidable into andout of a socket portion 195 in the chaser holder. The plug 193 has athreaded portion 196 engaging in'a mating threaded opening 197 in thechaser holder and has a head 198 which at its end may be providedwith apolygonal socket 199 to receive an actuating tool by which it may beturned. At

the inner end of the threaded portion is a circular shoulder 200 whichmay enter a counterbored portion 201 at the outer end of the plugpassage. This shoulder is of sufliciently smaller diameter than thecounterbore to permit the plug 19to adjust itself to the toothed face ofthe chaser, but the difference in size is too small to permit the plugto become disengaged therefrom. By unscrewing the plug 193, however,this shoulder is first withdrawn from the counterbore and the taperingrear end of the head 194 then engages the upper wall portion of theperforation 191 and wedges the plug .19 against the action of the spring21 out of engagement with the chaser whereupon the chaser can beremoved. The tapering front end of the head 198 exerts asimilarreleasing action on insertion of the plug 193 after it has beenremoved for any reason.

The serrations 15 of the chase may act a a rier.

gage in the sharpening operation, at each grinding operation the amountof stock removed being equal to the space between adjacent serrations.The chasers can then be returned to position in the die with assurancethat the cutting edges will be in the same relation to the work asbefore the sharpening the chaser being moved inwardly the definiteincrement of one tooth further than its position before sharpening.

In Figures 3, 4 and-5 a modification is shown in which a micrometeradjustment of the chaser can be effected. As there shown the plug 190 isprovided with a slot 25 at one side within which normally extends theinner end of a latch plug 26 which is removably held seated in aperforation 2'? through a wall of the holder 6 as by means of a splitspring ring 270 positioned in a portion 28 of reduced diameter in theplug 26 and engaging the wall of the perforation 27: This plug 190 isslidably mounted in a carrier 30 axially rotatable in the holder 6, theplug 19 being eccentrically mounted relative to the axis of this carrierwhich can be turned as by means of a suitable implement inserted in apolygonal socket 31 in its outer end. By such rotation the plug 19 ismoved with a component of motion lengthwise of the chaser thus to movethe chaser lengthwise. The plug carrier 30 may be provided with a springlatch to retain it yieldably in any one of a plurality of adjustedangular positions, which, as shown comprises a plug 35 having a pointedend 36 pressed toward the periphery of the member 30 by a spring 3'?housed in a member 370 threaded in the chaser holder so' as to enter inany selected one of a series of peripheral recesses 38 therein broughtop posite to this pointed end.

In Figure 5a another micrometer adjustment construction is shown. Inthis figure the chaser is shown as provided instead of the serrations 15with spaced notches 42 defining transverse ribs 43. An annular shoulder44 on an adjusting screw 45 may be engaged in any of these notches andthis screw may then be screwed to the desired extent into athreadedsocket 46 in the holder.

The screw 45 is shown as provided with a screwall! driver slot 47 at itsouter end. It will be noted against the chaser, this all being takencare of by 1 the bearing of the chaser against the solid portion of theholder in contact therewith. Not only does this make for simpler andmore rigid and accurate and stronger construction but it also avoidswarping or other distortion of the chasers and holders occasioned bypressure of clamping elements thereon.

From an inspection of Figure 6 it will be seen that the outer edge 40 ofthe chaser is substantially in the same plane as the outer face 41 ofits car- Thus it is able to approach shoulders on work to be threaded orthe chuck for carrying the work as close as the chaser holder may bemade to approach it.

The chasers are designed to be moved inwardly toward the axis of the dieto closed position or to be moved outwardly to open position, all thechasers being moved simultaneously by a cam member 50 shown detached inFigure 15. This cam member has a central bore 51 which is slidable onthe shank portion 2 of the body member immediately back of the head 3and it is provided with cam extension portions 52 shown as ofsubstantially rectangular cross section which are inclined outwardlyfrom the axis of the die torot ward their free ends. These extensionelements 52 pass through slots 54 in the head 3 being clear therefromand into inclined openings 55 through the chaser holders with which theyhave bearing, each of these openings 55, there being one for each chaserholder fitting closely'the cam extensions 52. It will be noted that theelements 52 are one piece with the remainder of the cam member 'so thatthey are rigid therewith. When the cam member 50 is moved forwardlytoward the head 3 these cam extensions passing into the openings causethe chaser holders to move inwardly across the Figure 6. When the cammember 50 is moved rearwardly from the head 3, as shown in Figure 6a theengagement of the chaser holders on these cam extensions causes theholders to be moved outwardly to die open position as shown in FigureMeans are provided tending to hold the cam 50 in its rearward positionrelative to the head 3 so as to hold the chasers in open position. Asshown best in Figure 8 this means comprises'springs' 60 seated inoppositely disposed sockets 61 and 62 in the rear face of the head 3 andthe forward face of the cam member 50.

Means are provided, however, for holding the cam member in its forwardposition so that the chasers may be held closed, such means beingreleasable to permit the springs 60 to open the die. Such holding meansas shown comprise spaced segmental extensions 65 on the rear face of thecam member 56 spaced inwardly from a rearwardly extending outer rimportion 66. Cooperating with these segments 65 are segments v'70 of alocking ring 71 shown detached in Figure 16. These segments are sospaced that the segments 65 may pass therebetween when the member 50 andthe ring 71 are properly angularly related and when the cam member is indie closed position, permitting the cam to be moved to die openposition, as shown in Figures 6a. and 12. In

normal die closed position these segments are out of such angularposition, the segments 76 partially overlapping the segments 65 so thatthe cam member 50 is prevented from moving rearwardly, as shown inFigures 6 and 10. Four each of segments 65 and 70 are shown, theseengaging portions being chaser holders in closed position, but in anyevent at least three should be used to prevent possibility of tilting ofthe cam member which would throw the chasers off center. This permitsthe use of a cam member of such short axial engagement with the member 2that its bearing lengthwise thereon would not be sumcient to preventtilting were it held against opening movement atone side only of theaxis of the shank portion 2. This permits substantial shortening ofthedie without sacrifice of accuracy. By the use of multiple lochingmembers which are released simultaneously, the wear of the locking partsis minimized, thus prolonging the effective life of the die. The ring'11 is rockable on the shank 2 on a portion 73 back of the cam member,50 and against a shoulder -72 thereon and is held against rearwardmotion by means of a ring member 75 of annular cross section which inturn is held in proper position by end face 4 of the head into closedposition as shown in The segments 70 of the ring 71 extend outwardlyradially further than the segments 65 of the cam member 50 and theseextension end portions are formed with inclined cam faces 80 with whichcooperate inclined faces 81 of a releasing sleeve 85 shown detached inFigure 19. This sleeve 85 is axially slidable onthe outer face of thenut member Z6, this member having an annularshoulder portion 86 at itsrear end which forms a stop limiting the rearward sliding of the member85. The member 85 is cut away as at 90 adjacent to each cam surface 81to permit the extensions 80 of the segments 70 of the locking ring 71 topass freely and to permit this ring to rock between locking andreleasing positions. The outer face of the member 85 is formed toreceive with a press fit thereon an outer sleeve member 95. This memberis shown as provided with. a peripheral groove 96 with which may beengaged any of the usual releasing yokes (not shown) employed to stopthe advance of the releasing sleeve as the die continues to movelengthwise of the work thus to effect the releasing and resultantopening of the die. The members and 85 operate together as a unit andare made of separate pieces for ease in manufacture, particularly tofacilitate the formation of the cut away portions 96 and the cam faces81 with which the cam extensions 80 of the locking ring cooperate.

When the surfaces 80 and 81 are in contact as shown in Figure lathelocking ring is so angularly, related to the cam member 50 as to bringits segments '20 in slightly overlapping relation to the segments 65 ofthe cam 50. By drawing rearwardly on the sleeve 96 relative to the bodyportion 1, however, the cam faces 81 acting against the cam faces 86cause rotation of the ring member until the segments 70 come opposite tothe spaces between the segments 65, releasing all the segments 65simultaneously, whereupon the springs 61 force the cam member 56rearwardly and open the die. When the member 95 is moved forwardly aninternal shoulder portion 98 thereon engages the end portion of the rim66 of the cam member 50, continued motion forcing the cam memberforwardly and thus closing the die. As soon as this has been donesufficiently for the segments 65 to clear the segments 76 the ringmember 71 is rotated angularly to its locking position by means of aspring pressed plunger 160 seated in a socket 101 of one of the segments'70 and engaging an edge portion 102 at one of the openings 96 of thereleasing member 65. The forward end of the member 85 is provided with aperipheral groove 105 within which is positioned a ring member 106, theouter face of which rides within the rim 66 of the cam member 50,- andthe. release member 95 is provided with a forwardly extending annularhousing 126 within which the rear end portion of the cam 50 rides, thusto prevent the entry of chips or other foreign matter to the interior ofthe mechanism about the locking ring. The member '25 is provided with akeywa y' 116 for the reception of a key plug 111 projecting outwardlyfrom the shank portion 2 of the body member, thus to hold this ringmember '75 against rotation relative thereto while permitting it to beadjusted axially of the body by rotation of the adjusting nut 76. Theposition of the flange 86 of this adjusting nut determines the maximumopening the cam 50.

of the die since it limits the rearward motion of the cam member. Thisnut may be held in adjusted position by means of the set screw 115. Themember 75 is also keyed to the sleeve 85 as by the key 112 seated in asocket 113 in the member 75. The cam member 50 is held from angularmotion relatively to the body member by engagement of the cam extension52 in the head openings.

54. In Figure 16 the locking ring is shown as provided with a keyway116. This, however, has no function in the operation of the die, but isput in merely to aid in assembly.

In Figures 23 to 26 slightly modified constructions are shown, themodifications residing in the mechanism for turning the locking ring torelease In Figure 23 this release mechanism is actuated by the Work 150,the end of which engages an adjustable stop 151 threaded into a plug 152slidable Within the shank portion 2 of the body member. This shankportion is shown as provided with oppositely disposed longitudinal slots153 through which extends a rod 154, this rod being carried by the plug152. Opposite ends of the rod 154 have fixed thereto fingers 155 havinghooked portions 156 which engage over the flange 157 of the member 95.Thus as the chasers run up onto the work the end of the work contactsthe end of the stop 151, whereupon further relative motion endwisebetween the work and the die causes the plug 152 to be-moved rearwardly,moving the release member 95 to release thecam 50.

In Figure 24 the work 160 is shown as provided with a shoulder portion161, which when the work has been threaded to the desired extent,engages against the end of a plug 162 which rides in the shank portion 2of the body member, this plug 162 being connected through the bar 154and fingers 155' to the member 95 in the same manner as the member 154is shown in Figure 23.

In Figures 25 and 26 are shown external release mechanism in which anannular member 170 is substituted for the members 85 and 95 in theconstruction shown in the other Figures of the drawings, this member 170being keyed to the members as by the key 171. At 172 is shown a lockingring similar to the ring 71 heretofore described, except that it isprovided with a cam follower portion 173 with which cooperates a cammember 174 pivoted at 175 to the member 170. This cam member 174 has acam face 176 acting on the follower 173 and an actuating projection 177which extends outwardly of the periphery of the member 170. This member177 is designed to impinge upon a suitable fixed part of the machinewhen the threading has been carried to the desired extent, thusdepressing the cam member 174, causing its cam face 176 acting on thefollower portion 173, to rock the locking ring to released position.

From the foregoing description of certain embodiments of this inventionhaving thus been described it should be evident to those skilled in theart that various changes and modifications might be made withoutdeparting from the spirit or scope of this invention as defined by theappended claims.

We claim:

1. A die comprising a body portion, holders radially movable on an endface of said body portion, and a chaser of the tangent type carried byeach of said holders and adjustable relative to its holder at an angleto the line of motion thereof relative to saidbody portion, said chaserbeing radial grooves in one end face, a holder for each groove having atongue riding therein, and a tangent chaser for each holder, each saidholder having a tongue and groove connection on one side face with itschaser and the back face of each chaser back of its cutting teethbearing directly against its holder and one face of said chaser lying inslidable engagement with a face of said body portion.

4. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion to move said chasers positively to open or closedpositions, means tending to move said member to chaser open position,said member having at least three spaced segments, a locking ring havingspaced segments normally overlapping the segments of said member andpreventing movement of said member to open position, and means actuableto rock said ring to bring its segments opposite to the spaces betweensaid member segments to permit said-member to be moved to open positionand engageable with and actuable to move said member to closed position.

5. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion to move said chasers positively to open or closedpositions, means tending to move said member to chaser open position,said member having at least three spaced segments, a locking ring havingspaced segments normally overlapping the segments of said member andpreventing movement of said member to open position and means movableaxially of said body in one direction to rock said ring to bring itssegments opposite to the spaces between said member segments to permitsaid member to be moved to open position and in the opposite directionto move said member to closed position.

6. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion to move said chasers positively to open or closedpositions, means tending to move said member to chaser openposition,:said member having at least three spaced segments, a. lockingring having spaced segments normally overlapping the segments of saidmember and preventing movement of said member to open position, andmeans movable axially in said body in one direction to rock said ring tobring its segments opposite to the spaces between said member segmentsto permitsa'id member to be moved to open position, said means havingoperative connections to said member to cause movement of said means inthe opposite direction to move said member to chaser closed position.

7. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion and controlling the relative to the axis of said body, anda lock releasing member movable axially of said body and having matinginclined faces acting on axial motion thereof in one direction to engagesaid ring segment faces and rock said ring to bring its segmentsopposite to the spaces between said member segments to therebypermit-said member to move to chaser open position.

8. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion and controlling the relative positions of said chasers,means tending to move said member to chaser open position, said memberhaving at least three spaced segments thereon, a locking ring havingspaced segments normally overlapping said member segments and holdingsaid member in chaser closed position, said ring segments each having aface inclined to the axis of said body, and a lock-releasing membermovable axially of said body and having mating inclined faces acting onaxial motion thereof in one direction to engage said ring segment fecesand rock said ring to bring its segments opposite to the spaces betweensaid member segments to thereby permit said member to move to chaseropen position, and means tending to hold said ring in looking position.

9. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion and controlling the relative positions of said chasers,means tending to move said member to chaser open position, said memberhaving at least three spaced segments thereon, a locking ring havingspaced segments normally overlapping said member segments and holdingsaid member in chaser closed position, said ring having a face inclinedto the axis of said body, and a lock releasing member movable axially ofsaid body and having a mating inclined face acting on axial motionthereof in one direction to engage said ring face and rock said ring tobring its segments opposite to the spaces between said member segmentsto thereby permit said member to move to chaser open position, saidreleasing member having a portion engageable with said chasercontrolling member to move said controlling member to chaser closedposition on movement of said releasing member in the opposite direction.

10. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion and controlling the relative positions of said chasers,means tending to move said member to chaser open position, said memberhaving spaced segments thereon, a locking ring having spaced segmentsnormally overlapping said member segments and holding said member inchaser closed position, said ring segments each having a face inclinedto the axis of said body, and a lock releasing member movable axially ofsaid body and having mating inclined faces acting on axial motionthereof in one direction to engage said ring segment faces and rock saidring to bring its segments opposite to the spaces between said membersegments to thereby permit said member to move to chaser-open position,and a member positioned in the path of work operatively connected tosaid releasing member whereby to open said chasers when the work hasbeen threaded to a predetermined point.

11. A die having a body portion, chasers carried thereby and relativelymovable to open and closed positions, a member movable axially of saidbody portion and controlling the relative positions of said chasers,means tending to move said member to chaser open position, said memberhaving at least three spaced segments thereon, a locking ring havingspaced segments normally overlapping said member segments and holdingsaid member in chaser closed position, said ring segments each having aface inclined to the axis of said body, and a lock releasing membermovable axially of said body and having mating inclined faces acting onaxial motion thereof in one direction to engage said ring segment facesand rock said ring to bring its segments opposite to'the spaces betweensaid member segments to thereby permit said member to move to chaseropen position, said releasing member having a portion engageable withsaid chaser controlling member to move said controlling member to chaserclosed position on movement of said releasing member in the oppositedirection.

12. A die having a body portion, chasers mounted for motion from andtoward the axis of said body portion to open and close said die, amember movable axially of said die and having operative connections tosaid chasers for positively opening and closing said die on axialmovement of said member, means tending to move said member to die openposition, means for preventing such movement, and an element movableaxially of said die for rendering said preventing means inoperative bymovement in one direction and for moving said member to die closedposition by movement in the opposite direction.

13. A die having a body portion having a head at one end, chaserscarried on the end of said head for movement toward and from the axis ofsaid body to die closed and open positions, a member movable axiallyof'said body portion and having operative connections to said chaserswhereby axial movement of said member away from said head moves saidchasers to open position and movement toward said head moves saidchasers toward closed position, said member having spaced segments on aface remote from said head, a locking ring journaled on said body por-'tion and having spaced segments normally overlapping said membersegments and preventing movement of said member to open position, springmeans tending to move said member to open position, means for holdingsaid ring against axial movement, said ring segments having extensionsprovided with inclined faces, a sleeve movable axially of said bodyportion and having inclined faces mating said ring segment inclinedfaces to turn said ring into position to permit said member segments topass between said ring segments as said sleeve is moved away from saidhead, means for preventing relative rotation between said body portionand sleeve, and means for yieldingly holding said ring in angularlocking position, said sleeve having a portion engaging said member tomove said member to closed position on movement of said sleeve towardsaid head sufficiently to permit return of said ring to lockingposition.

ERNEST T. BYSSI-IE. ROBEBT R. FINN.

